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I don't have Leopard so I can't tell you how to uninstall, but they only use 10.7 megs. Do you really need the space that bad?

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yes u can for ichat have a icon, just find any picture you want and drag it on to were ur old icon waz. I downloaded aim on my mac 4 free. It's better i think. Yup ppl on aim can talk 2 u. The last question i don't understand. But a good advantage to ichat is that if u have a camera u can talk to ppl through it. Or if u dont sometimes even voice chat too!! but i also like aim cuz u can download icons and they r better i think. Also it haz better smileys and font kinda stuff.... well i hope this helps.